Bumper, especially applicable to railway vehicles



. Oct. 21, 1941. v J. MERCIER 2,260,277

BUMPER, ESPECIALLY APPLICABLE TO RAILWAY VEHICLES Original Filed March7, 1936 Patented Oct. 21, 1941 BUMPER, ESPECIALLY APPLICABLE TO RAILWAYVEHICLES Jean Mercier, Paris, France Original application March 7, 1936,Serial No.

Divided and this application December 12, 1939, Serial No. 308,885. InFrance March 3 Claims.

My present invention relates to bumpers for railway vehicles and it hasfor its object to provide another embodiment of the generic invention'disclosed in my application flied March 7, 1936,

Ser. No. 67,715, new issued as Patent No. 2,187,625, of which thepresent application is a division.

Essentially the present invention provides two or more butters, disposedon either side of the longitudinal axis of the vehicle, the buflersbeing rigidly connected with two or more pistons, respectively, movablein corresponding cylinders which contain, at one side of the pistons, acompressible fluid, and at the other side of the pistons anincompressible fluid, the cylinder for a piston at one side being soconnected with the cylinder for a piston at the other side as to eflectcommunication between the incompressible fluid sides of the cylinder,whereby the fluid from a cylinder at one side of the vehicle will flowto the cylinder at the other side, and vice versa, according to therespective movements of the pistons.

Other objects will in part be obvious and in part be pointed outhereinafter.

To the attainment of the above objects and ends the invention stillfurther resides in those novel features of construction, combination andarrangement of parts, all of which will be first fully described in thefollowing detailed description and then be particularly pointed out inthe appended claims, reference being had to the ac-- companying drawing,in which F18. 1 is a horizontal section illustrating the invention.

Fig. 2 is a diagrammatic view illustrating the working of the systemaccording to the invention.

In the drawing, in which like numbers of reference indicate like partsin both figures, i and 2 represent two railway vehicles each of whichhas a fixed cylinder 3 located one at each side of the axes of thevehicle.

The cylinders I of one vehicle align, respectively, with those of theopposing vehicle.

Within each cylinder is a piston 4 whose rigid rod carries a buffer 1.Each cylinder encloses a chamber 5 containing acompressible fluid and achamber 4 containing an incompressible liquid. The chambers i are at therear sides of the pistons, while the chambers I are at the fore sidesthereof. W

Preferably, the chambers I of the cylinders I are connected by a conduit0 which acts as an equalizing conduit and which, if desired, may beomitted without greatly aflecting the operation of the device.

A conduit 8 connects the chambers 6 of the pistons and contains. also,an incompressible liquid which communicates with that in chambers 6 and6 and constitutes therewith a shiftable rigid connection between pistons4 and 4.

Therefore when a car is negotiating a curve,

the incompressible liquid passes from one cylinder to the other througha conduit 8; one of the buflers 'l is pushed in while the other movesout the same distance, because of the suction produced by the in-movingpiston on the incompressibie liquid. when a sudden shock occurs and bothbuffers l are pushed in simultaneously, the piston will compress thefluid in chambers 5-5 (and conduit 9, if such be used), thus absorbingthe shock.

To supply incompressible liquid to or to discharge it from theapparatus,-I provide, on conduit 8, a tube III which, when not in use,is closed by suitable means.,

From the foregoing description, taken in connection with theaccompanying drawing, it is thought that the construction, operation andadvantages of the invention will be clear to those skilled in the art.

What I claim is: 1

l. A bumper device of the type described, for use in connection with avehicle and especially a railway vehicle, which comprises, incombination, at least two buflers movably carried by said vehicle oneither side of the longitudinal axis thereof, two cylinders rigidlycarried by said vehicle, pistons movable with a fluidtight fit insidesaid cylinders respectively and rigid with said bufl'ers respectively, apassage interconnecting the respective chambers of said cylinders thatare located on the outer sides or said pistons, an incompressible liquidfilling the whole or these two chambers and said passage, and acompressed gas nlling the two other chambers or said cylinders,respectively, said pistons oemg normally disposed spaced from the endsor their respective cylinders in order that the buners can move ineither direction from their normal positions in which both are in thesame transverse plane.

2. A bumper device accoramg to claim 1, further including a passagemterconnectmg the two last mentioned chambers.

3. A bumper device according to claim 1, further including a conduitcommunicating with the flrst mentioned passage for feeding liquidthereinto.

JEAN MERCIER.

